The Seiko 3421-5280 is a watch model based on the 3421 movement.
Parts List
| SA2W96GN00 | crystal - crystal |
| 35M78NS1 | crown - crown |
| FH2380B0A | case back gasket - case back gasket |
| 86560580 | crystal gasket - plastic gasket for crystal |
| 86560581 | crystal gasket - plastic gasket for crystal |
| 86560560 | bezel gasket - plastic gasket for bezel |
| HA01A | band - band |
| 08T26AGH | others - hour hand |
| 08T26CGM | others - minute hand |
| 08T26DGM | others - minute hand |
| 08T26NGH | others - hour hand |
| 08SC14NG | others - second hand |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 0354546 | others - winding stem |
| 83118370 | others - case ring |
| 342152806Y | others - case |
| 82330243 | others - bezel |
| 342152806YA | others - case |
| 0884890 | others - holding ring for dial |
| 34210650X989 | others - dial |
| 34210650X999 | others - dial |
| 34211 | others - machine code |
| 0Z0060B01 | others - crown and stem gasket |
Caliber 3421
